US2584463A - Threading die - Google Patents

Description

1952 c. H. INGWER ET AL 3 THREADING DIE Filed Sept. 23, 1946 5 Sheets-Sheet l IN VE N TORS CARL INGWEI? BY CLYDE E WRIGHT Feb. 5, 1952 c. H. INGWER ET AL Tl- READING DIE Z5 Sheets-Sheet 2 Filed Sept. 23. 1946 Dun . INVENTORS CARL H. INGWER CLYDE E WRIGHT Feb. 5, 1952 4 c. H. INGWER El AL 2,584,463

I THREADING DIE Filed Sept. 23. 1946 s Sheets-Sheet :5

* Q II All II III I HR I Q 7 INVENTORS CARL h. INGWER CLYDE E. WRIGHT Patented Feb. 5, 1952 UNITED STATES EATENT OFFICE THREADING DIE Carl H.- Ingwer and Clyde E. Wright, Elyria, Ohio Application September 23, 1946, Serial No. 698,667

this type are ordinarily used for threading pip varying from 2%; to 4 inches in diameter. Obviously, such a tool was necessarily heavy and cumbersome. It is necessary to lift a tool of this character intd position each time a pipe is to be threaded as well as to again lift it to re- A move the same from the pipe where it has been threaded. The fact that these devices were made solely with a View to utility entailed the use of certain structure which also caused further dif-,

flcultyin handling. The device of the present invention is so designed that the facility with which it may be handled is greatly increased.

Further, the 1300i Of the present invention is SO constructed that parts which are subject to wear may be easily and quickly replaced without the aid of special tools.

Another advantage of the evice of this invention resides in the fact that the gear train is completely enclosed, protecting" the workman against injury, retaining the lubricant and preventing the ingress of dirt, chips or foreign material; Furthermore. an improved cutting action is afforded, and at the end of the cutting operation, the chasers are withdrawn from contact with the cut threads; preventing mutilation of the threads when the tool is backed ofi of the thread. H

Still other advantages of the invention, and

the inventionitself; will become more apparent by reference to the following description of an embodiment thereof, which description is illustrated by the accompanying drawings and forms a part of this specification.

In the drawings:

Fig l is a vertical medial section of a threading tool embodying the invention; with ertain parts removed from the. work holder to clarify the invention;

Fig. 2 is an end elevational view of the tool I from the chaser carrying end;

Fig. 3 is an end elevational view of the tool from the work holder end with the work holder parts place; r

Fig; 4 is an exploded view showin restarts in side elevation.

Referring now to the drawings throughout which like parts are designated by like reference characters, the device includes a work holder, Figs. 1 and 3, which comprises a frame II! of generally, circular conformation and having extending threadedly therethrough screws II and I2, Fig. 3, which project radially toward the axis of the frame. The end of the work holder is of reduced diameter at I3 to provide a bearing for a gauge ring [6 which is journalled thereon and held in place by a split ring I5 which is seated in a groove I6. The gauge ring is provided with stepped portions adapted for engagement with the heads of the screws I2, to provide a quick and accurate means for adjusting the holders for the various specific sizes of pipe to be threaded.

The work holder is connected by legs I8 to a ring I9 having teeth 2!] on the periphery which are adapted for driven engagement with a pinion as hereinafter more fully described.

The ring gear I9 is provided with a reduced cylindrical barrel 22, the outer surface of which provides a bearing surface for the housing 23.

The housing 23 comprises a generally cylindrical outer portion adapted to extend over and protect the ring gear. A pair of handles 24, Fig. 2, extend from opposite sides of the housing which serve as a convenient means for lifting the tool.

The housing 23 is provided with an inwardly extending flange 26, the inner periphery of which is adapted to be seated on barrel 22, which provides a bearing support therefor. The barrel 7'2 is sufficiently long to extend beyond the flange 26 and is provided with a peripheral groove 21, Fig. 4, into which a split ring 28 is snapped. The ring 28 engages the outer Surface of the flange 26 to hold the housing in assembled position relative to the ring gear. At the same time, the housing is free to rotate on the barrel.

v It will be noted, as best shown in Fig. 1, that the flange 26 is slightly narrower than the space between the split ring 28 and the side of the ring gear I9 to provide a clearance space 29 which allows relative longitudinal movement between the ring I9 and the housing, the purpose of which will later be explained.

Intermediate the handles 24, at the lower side as viewed in Fig. 1, the housing is formed with a hollow boss 3! adapted to support and house the drive pinion 32 and its guide 33. The drive pinion is provided withteeth 34 adapted to me h with the teeth 20 on the ring gear, and is carried by a shaft 35 which is provided with a square or exagona driving and 3t.

The end of the shaft 35 may be of reduced diameter at 3? and r'otatably journalled in an of dirt or foreign material.

opening provided for it in the end wall of the housing 3|.

The shaft 35 is rotatably journalled in an 011- less sleeve bearing 38 which is threaded at 48 adapted to be screwed into a threaded opening in the housing 3i. The interior of the sleeve is provided with the graphite rings 33' as indicated in Fig. 1. This construction allows the pinion and its shaft to be easily assembled in the housing and to be easily removed when desired for replacement when worn. A flange 4| on the sleeve seats in a circular recess around the opening to prevent the sleeve from extending into the housing too far and furnish a sturdy support for the sleeve when screwed in place.

A flange 42 between the ring gear and the Work holder extends outwardly in closed spaced relation to the inner wall of the housing 23 to provide a guard for the gear and prevent the ingress this flange is in spaced relation to the housing and does not engage therewith, the sole bearing for the housing being the barrel 22.

Also supported by the housing are a plurality of chaser control posts 44, each of which is secured in the housing flange 25, which is provided with strengthening bosses 45, best shown in Fig. 4. Each post has a circular base portion 43 which has a press fit with openings in the bosses 45 and the housing wall and is pinned by a pin 4'! to hold the same securely in place.

The inner face of each post is cut away at 48 to provide an inclined flat plane surface adapted for engagement with the base end of a chaser carried in the chaser holder. Five such members are shown, but it will be appreciated that the number may be varied.

The chaser holder comprises a generally circular frame 55 having five radially extending bosses on the outer face, the bosses being provided with radially extending channels in which are disposed the chasers 52. The outer end of each channel is provided with a circular opening through which the posts 44 extend. The inner face of the frame 58 is provided with a circular recess in which the flange 54 of an exteriorly threaded sleeve 55 is secured to the frame 58 by screws 58 that extend through the flange 54 and are in threaded engagement with the frame.

The flange 54 covers the channels which thus l provides guideways for the chasers. This construction thus provides a convenient and economical manner of forming the chaser guide ways, and the removability of the sleeve provides a quick and easy means for replacing the sleeve when it becomes worn through use or when the threads become damaged.

The inner face of the flange 5 is provided with blind holes 56 in which bullet catches are disposed, having spring pressed balls 5! adapted to engage in detents in the side of the chaser.

The frame is provided with a hollow boss 5? at its lower end, as viewed in Fig. l, and which is disposed in alignment with the boss 3! on the housing 23, adapted to receive therethrough the sleeve 38. The sleeve 55 is in threaded engagement with the interiorly threaded barrel 22.

In operation, the pipe to be threaded is secured in a vise and the plate i4 is adjusted to a position wherein the proper shoulders engage with the screws i2, which are turned inward until their heads engage the plate. In this position the screws are adjusted to the proper position to hold the pipe. After the adjustment, the threader is placed with the work holder over the pipe and It is to be noted that i the end of the pipe disposed for engagement with the chasers 52. The screw I! is then screwed inward, the three screws securely holding the threader on the end of the pipe.

The pinion 32 is then rotated, through the stem 35, by means of a wrench disposed on the squared end 36 of the stem. The stem end 36 is adapted to receive either a wrench, a ratchet or a power drive as desired. When the pinion is rotated clockwise, it travels around the ring gear I9 and carries with it the housing 23 which rotates on the barrel 22. The housing 23, through the posts 44 and the sleeve 38, rotates the chaser frame 50. The sleeve 55, through its threaded engagement with the barrel 22, travels inward toward the pipe, drawing the chasers into thread cutting engagement with the pipe.

When cutting threads, the stem 35 is rotated clockwise which causes the housing 23 to rotate in a clockwise direction which motion is transmitted to the chaser frame and to the threaded sleeve through the posts 44 and sleeve 38. Since the sleeve 55 and chaser frame 58 because of their threaded engagement with the housin ring gear 20-22 are being pulled toward that gear, and since there will be considerable friction between the frame 50 and the posts 44 and sleeve 38, the housing 23, therefore, urged by the friction on the posts 44 and sleeve 38, will move towards the ring gear causing the flange 26 to abut the inner face of the ring gear closing the gap 29, the flange 26 being moved away from the snap ring 28. During this first movement, the chasers and the posts move together until the gap 23 is closed, cutting a straight thread on. the pipe.

The power is applied continuously until the desired number of threads are cut on the pipe. Each revolution of the chaser frame causes the sleeve to be threaded further into the barrel 22, and after the gap 29 is closed, since the chaser frame moves inward relative to the housing, the posts 44 slide through the chaser frame; and the chasers, which abut the inclined surface 48, gradually recede to cause the proper taper of the threads being cut.

When the desired threads have been cut, the direction of rotation of the pinion 32 is reversed. This causes the chaser carrying frame to be moved outward relative to the housing. The first movement in the reverse direction, because of the friction between the frame and the posts 44 and sleeve 38, causes the housing to move longitudinally on the barrel against the split ring 28, causing the space 29 to again be realized between the ring gear and the flange. This then causes the chasers to recede still further, even though normally the action on removal of the die would cause the chasers to move inward. Thus, the chasers are immediately relieved from their pressure against the threads. Continued movement in the counter-clockwise direction causes the chasers to be backed off of the threads, which movement is continued until the chasers are completely out of engagement with the now threaded pipe.

It will be noted that, because of the relative movement possible between the housing and the barrel, and that because the chaser carrier is in threaded engagement with the barrel, the housing and chaser controlling posts can thus move slightly relative to the ring gear and the chaser carrier. This, as explained, causes an unusual action in that at the start of the threading operation, when the chasers would normally start receding, they actually stand still, which starts the cutting action sooner and conditions the device for the subsequent operation previously described {where the chasers are actually caused to recede slightly when the normal action would be for them to move inward when the chasers are being backed ofi. This provides for clean threads which are not mutilated when the chasersjare backed oif of the threads.

It will also be seen that the construction is such'that a greater driving force may be appliedjto the chaser carrier because not only do the posts drive the chaser carrier, but a considerable amount of driving force is applied to the chaser carrier by the sleeve 38 at the exact" point-where the greatest force is needed.

Furthermore, the manner in which thesleevc,

pinion and the shaft are assembled in the nous-'- ing provides a strong, simple and economicalv I manner of assembly which allows quick replacement when necessary or desirable.

The manner in which the housing is assembled.

on the barrel is also quick and economical and enables disassembly without the need of special tools and is such that there are no screws to come loose during operation and become lost.

The two piece construction of the chaser frame provides for accurate economical construction and quick and economical replacement of parts.

Having thus described the invention, it is ap-- preciated that numerous and extensive departures may be made therefrom without departing ery of the ring gear, chaser posts carried by said housing, a bearing sleeve formed for threaded engagement with said pinion housing and a shaft journalled in said sleeve and having a pinion thereon adapted for driving engagement with, v saidring gear, a chaser carrying housing formed with radially extending chaser channels, and

chassis in said channels, a circular recess formed in said housing and a threaded barrel having a flange secured in said recess and closing said chaser channels, friction means carried by said flange and frictionally engaging said chasers, said barrel being in threaded engagement with said work holder barrel and said chaser posts 6 extending through said housing and in control ling engagement with said chasers.

2. A thread cutting tool including a work holder, a ring gear integral with the work'holder and a barrel extending from said ring gear, a housing rotatably journalled on said barrel and having a guard portion surrounding the ring gear, ring means afiixed to said barrel for securing the housing on said barrel, a pinion housing formed on said housing opposite the periphery of the ring gear, chaser posts carried by said housing, a bearing sleeve formed for threaded engagement with said pinion housing and a shaft journalled in said sleeve and having a pinion thereon adapted for driving engagement with said ring gear, a chaser carrying housing-formed with radially extending chaser channels, and chasers in said channels, a circular recess formed in said housing and a threaded barrel having a flange secured in said recess and closing said chaser channels, friction means carried by said flange and frictionally engaging said chasers, said barrel being in threaded engagement with said work holder barrel and said chaser posts extending through said housing and in controlling engagement with said chasers, said first housing being movable longitudinally, on said work holder barrel relative to the work holder and the chaser holder to move said chasers into the work at the start of a threading operation and out of engagement with the work at the end of the cutting operation.

CARL H. INGWER. CLYDE E. WRIGHT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 971,941 Vosper Oct. 4, 1910 1,052,769 Tewksbury Feb. 11, 1913 1,153,835 Walter Sept. 14, 1915 1,168,779 Bacon Jan. 18, 1916 1,199,393 Lidke Sept. 26, 1916 1,284,709 Koehler Nov. 12, 1918 1,404,996 Nonneman Jan. 31, 1922 1,404,997 Nonneman Jan. 31, 1922 1,459,240 Nonneman June 19,, 1923 1,481,191 Elliott Jan. 15, 1924 1,616,649 Borden Feb.8, 1927 1,655,072 Oster Jan.3, 1928 1,794,806 Tewksbury Mar. 3, 1931 1,808,315 Nonneman June 2, 1931 1,852,186 Nonneman Apr. 5, 1932 2,076,831

Thewes Apr. 15, 1937

Images